The U.S. Environmental Protection Agency's Office of Transportation and Air Quality's Compliance Division issued the four reports below. These reports offer a convenient reference to the data that the Compliance Division collects in implementing emissions regulations for vehicles, engines, and other motorized equipment. 

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• 2012-2013 Progress Report: Vehicle Engine & Compliance Activities (PDF) (87 pp, 2.2MB, EPA-420-R-15-007, October 2015)
• 2009-2011 Progress Report: Vehicle and Engine Compliance Activities (PDF) (74 pp, 11MB, EPA-420-R-13-006, December 2013)
• 2008 Progress Report: Vehicle and Engine Compliance Activities (PDF) (49 pp, 3.9MB, EPA-420-R-10-022, August 2010)
• 2007 Progress Report: Vehicle and Engine Compliance Activities (PDF) (64 pp, 890K, EPA420-R-08-011, October 2008)